I just put a small Lyman globe front sight on a Marlin 1895 CB. It came with several inserts. Small bead, skinny post, wide post,and several size circles. Can anybody kinda give me a rundown on the're different purpose. It's got a Williams F.P. on the rear. I usually shoot at black bullseye targets, so I was thinking of one of the posts with a 6 o'clock hold. Those circles are what I question most.